//全选、反选、清空checkbox
	function selcheck(formname,flag) 
	{
	  
	   var objform= window.document.getElementsByName(formname)[0];
	   if(objform!=null)
	   {
	     var objs =objform.getElementsByTagName("input");
		  for(var i=0; i<objs.length; i++) 
		  {
		    if(objs[i].type.toLowerCase() == "checkbox" )
		    {
		      if(flag==1)
		        objs[i].checked = true;
		      if(flag==0)
		        objs[i].checked = false;
		      if(flag==2)
		        objs[i].checked = !(objs[i].checked);
		
		    }
		  }
	  }
	}

	
	
function changedb(formname)
{ 
  // alert("fff");
   var objform= window.document.getElementsByName(formname)[0];
   var objs = objform.getElementsByTagName("input");
   dbids="";
   flag=0;
  for(var i=0; i<objs.length; i++) 
  {
    if(objs[i].type.toLowerCase() == "checkbox" )
    {
       
       if(objs[i].checked)
       {
         
         dbid=objs[i].value;
         if(flag==1)
           dbids=dbids+","
          dbids=dbids+dbid
          
         flag=1
         
       }
    }
  } 
  if(dbids=="")
  {
	 // alert("请选择资源库！")
	  return false;
  }
  else
  {
    objform.tempdbid.value=dbids
    return true;
  }
  
  
}